An Update on Monitoring Stellar Orbits in the Galactic Center

@article{Gillessen2017AnUO,
  title={An Update on Monitoring Stellar Orbits in the Galactic Center},
  author={Stefan Gillessen and Philipp M. Plewa and Frank Eisenhauer and R. Sari and Idel Waisberg and Maryam Habibi and Oliver Pfuhl and E. M. George and Jason Dexter and S. D. von Fellenberg and Thomas Ott and Reinhard Genzel},
  journal={The Astrophysical Journal},
  year={2017},
  volume={837}
}
Using 25 years of data from uninterrupted monitoring of stellar orbits in the Galactic Center, we present an update of the main results from this unique data set: a measurement of mass and distance to Sgr A*. Our progress is not only due to the eight-year increase in time base, but also to the improved definition of the coordinate system. The star S2 continues to yield the best constraints on the mass of and distance to Sgr A*; the statistical errors of 0.13 × 10 6 M ⊙ and 0.12 kpc have halved… 

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